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arXiv 1402.5989hep-ph
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Peccei-Quinn对称纯引力中介

Peccei-Quinn Symmetric Pure Gravity Mediation

Jason L. Evans, Masahiro Ibe, Keith A. Olive, Tsutomu T. Yanagida

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17 pages, 7 figures
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摘要：

具有辐射电弱对称性破缺的纯引力介导模型可以用两个自由参数来表示，即引力子质量和$\tan β$。这些模型很容易支持125-126 GeV的希格斯质量，代价是多TeV范围内的标量谱和更轻的wino作为最轻的超对称粒子。在这些模型中，它也是相当通用的，希格斯混合质量参数，$μ$，这是由希格斯势的最小化，也是在多TeV的范围内。对于$μ> 0$来说，winos的热遗迹密度太小，无法解释暗物质。对于$μ< 0$也是如此，除非引力子的质量是500 TeV量级。在这里，我们认为起源的多TeV $μ$参数所产生的击穿的Peccei-Quinn（PQ）对称性。PQ对称性破缺场$P$与MSSM希格斯二重态的耦合，自然会导致$μ\sim \langle P \rangle^2 /M_P \sim \mathcal{O}(100)$ TeV的值，以及PGM模型所需的阶数。在这种情况下，轴子构成了暗物质或暗物质的一部分，其余部分由热或非热中微子组成。我们还提供了解决方案的问题等曲率波动与轴子暗物质在这种情况下。

英文摘要：

Successful models of Pure Gravity Mediation (PGM) with radiative electroweak symmetry breaking can be expressed with as few as two free parameters which can be taken as the gravitino mass and $\tan β$. These models easily support a 125-126 GeV Higgs mass at the expense of a scalar spectrum in the multi-TeV range and a much lighter wino as the lightest supersymmetric particle. In these models, it is also quite generic that the Higgs mixing mass parameter, $μ$, which is determined by the minimization of the Higgs potential is also in the multi-TeV range. For $μ> 0$, the thermal relic density of winos is too small to account for the dark matter. The same is true for $μ< 0$ unless the gravitino mass is of order 500 TeV. Here, we consider the origin of a multi-TeV $μ$ parameter arising from the breakdown of a Peccei-Quinn (PQ) symmetry. A coupling of the PQ-symmetry breaking field, $P$, to the MSSM Higgs doublets, naturally leads to a value of $μ\sim \langle P \rangle^2 /M_P \sim \mathcal{O}(100)$ TeV and of order that is required in PGM models. In this case, axions make up the dark matter or some fraction of the dark matter with the remainder made up from thermal or non-thermal winos. We also provide solutions to the problem of isocurvature fluctuations with axion dark matter in this context.

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